A 60-kg swimmer dives from a 150-kg raft with a horizontal speed of 1.5 m/s
The raft is initially at rest. What is the speed of the raft immediately after the diver jumps?
0.60 m/s
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Motional Emf: An eagle, with a wingspread of 2.0 m, flies toward the north at 8.0 m/s in a region where the vertical component of the earth's magnetic field is 0.20 × 10-4 T. What emf would be developed between the eagle's wing tips? (It has been speculated that this phenomenon could play a role in the navigation of birds, but the effect is too small, in all likelihood.)
Fill in the blank(s) with the appropriate word(s).
A 400-W computer (including its monitor) is turned on for 8.0 hours per day. If electricity costs 10¢ per kWh, how much does it cost to run the computer annually for a 365-day year?
A) $120 B) $1200 C) $15 D) $150
If a single force acts on a moving object
A. the momentum of the object will change only if the force is in the same direction as the velocity of the object. B. the momentum of the object can only change direction, not magnitude. C. the momentum of the object must change. D. the momentum of the object can only change magnitude, not direction.
A person's eye lens is 2.8 cm away from the retina. What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?
A) -2.8 cm B) 2.8 cm C) -2.4 cm D) 2.4 cm E) 2.2 cm